US2551852A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centered rotation-symmetrical schmidt type optical system
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-07-15
•
Granted: 1951-05-08
•
Expires: 1966-07-15
Abstract
No abstract record available.
Inventors
- 👤 Rinia Herre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:35
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0888
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB190303058A
Cited
GB426539A
Cited
US2170979A
Cited
US2273801A
Cited
US2332930A
Cited
US2336379A
Cited
US2298808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |